Shops are evil in the way they sell irresistible death foodstuffs by the checkout. Get away from shops/food/adverts by getting a cool hobby in the great outdoors. ie long walks listening to podcasts etc. Come back hours later, feeling fulfilled, happy healthy. The less one eats in a day, the less hungry you become. Also less sugar in diet means less hungry too (sugar crash makes for stronger hunger). I have a terrible sweet tooth, but that goes away after about a week or so of abstaining.